CALCULATENORMAL

THE BOX'S MAIN HELP:

This function returns the normal vector of the triangle PUV.
If any of these vectors are of zero length,
then a zero length vector is returned.

P (input):

This is the first point on the triangle. The default is state->point.
If any of these vectors are of zero length,
then a zero length vector is returned.

U (input):

This is the second point on the triangle. The default is state->u_deriv.
If any of these vectors are of zero length,
then a zero length vector is returned.

V (input):

This is the third point on the triangle. The default is state->v_deriv.
If any of these vectors are of zero length,
then a zero length vector is returned.

OUT (output):

This function returns the normal vector of the triangle PUV.
If any of these vectors are of zero length,
then a zero length vector is returned.

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